repository/src/main/java/org/apache/atlas/gremlin/Gremlin2ExpressionFactory.java [150:177]:
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    @Override
    public GroovyExpression generateLikeExpressionUsingFilter(GroovyExpression parent, String propertyName, GroovyExpression propertyValue) throws AtlasException {
        GroovyExpression itExpr      = getItVariable();
        GroovyExpression nameExpr    = new FieldExpression(itExpr, propertyName);
        GroovyExpression matchesExpr = new FunctionCallExpression(nameExpr, MATCHES, escapePropertyValue(propertyValue));
        GroovyExpression closureExpr = new ClosureExpression(matchesExpr);

        return new FunctionCallExpression(TraversalStepType.FILTER, parent, FILTER_METHOD, closureExpr);
    }

    private GroovyExpression escapePropertyValue(GroovyExpression propertyValue) {
        GroovyExpression ret = propertyValue;

        if (propertyValue instanceof LiteralExpression) {
            LiteralExpression exp = (LiteralExpression) propertyValue;

            if (exp != null && exp.getValue() instanceof String) {
                String stringValue = (String) exp.getValue();

                // replace '*' with ".*", replace '?' with '.'
                stringValue = stringValue.replaceAll("\\*", ".*")
                                         .replaceAll("\\?", ".");

                ret = new LiteralExpression(stringValue);
            }
        }

        return ret;
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repository/src/main/java/org/apache/atlas/gremlin/Gremlin3ExpressionFactory.java [247:274]:
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    @Override
    public GroovyExpression generateLikeExpressionUsingFilter(GroovyExpression parent, String propertyName, GroovyExpression propertyValue) throws AtlasException {
        GroovyExpression itExpr      = getItVariable();
        GroovyExpression nameExpr    = new FieldExpression(itExpr, propertyName);
        GroovyExpression matchesExpr = new FunctionCallExpression(nameExpr, MATCHES, escapePropertyValue(propertyValue));
        GroovyExpression closureExpr = new ClosureExpression(matchesExpr);

        return new FunctionCallExpression(TraversalStepType.FILTER, parent, FILTER_METHOD, closureExpr);
    }

    private GroovyExpression escapePropertyValue(GroovyExpression propertyValue) {
        GroovyExpression ret = propertyValue;

        if (propertyValue instanceof LiteralExpression) {
            LiteralExpression exp = (LiteralExpression) propertyValue;

            if (exp != null && exp.getValue() instanceof String) {
                String stringValue = (String) exp.getValue();

                // replace '*' with ".*", replace '?' with '.'
                stringValue = stringValue.replaceAll("\\*", ".*")
                        .replaceAll("\\?", ".");

                ret = new LiteralExpression(stringValue);
            }
        }

        return ret;
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